How to solve the problem of redrawing the page of gesture zoom and rotate pictures on the mobile terminal in Vue development

With the popularity of mobile devices and the development of applications, mobile gesture operations have become one of the important ways for users to use mobile applications. In mobile application development, we often encounter functional requirements for image scaling and rotation. However, when developing using the Vue framework, due to the characteristics of Vue, it is easy to cause page redrawing problems. This article will introduce how to solve the problem of page redrawing of gesture zoom and rotate pictures on the mobile terminal in Vue development.

First, let us understand the characteristics of Vue. Vue is a progressive framework for building user interfaces. It has the concept of virtual DOM (Virtual DOM), is based on a declarative programming paradigm, and drives views through data. The core idea of ​​Vue is to bind data and views, and automatically update the view in response to changes in data, thereby realizing automatic redrawing of the page.

However, during mobile gesture operations, the position, size and style of page elements will change, and Vue's automatic redraw mechanism will cause page elements to be re-rendered, causing performance loss. Especially during the process of image scaling and rotation, the problem of page redrawing becomes more obvious, affecting the user experience.

In order to solve this problem, we can use the following methods:

1. Use custom instructions: Vue's custom instructions can be used to extend the capabilities of HTML and can be used in the DOM Add custom behavior to the element. We can handle gesture operation events through custom instructions and directly operate DOM elements without using Vue's responsive mechanism, thus avoiding page redrawing problems.
2. Use local components: In Vue, we can wrap a component in another component to form a local component. We can encapsulate the gesture operation area as a local component and use native JavaScript methods in the component to handle gesture operation events. This prevents Vue's responsive mechanism from redrawing the page.
3. Use the v-once directive: Vue’s v-once directive allows elements and components to be rendered only once and not updated again. We can mark the gesture operation area as v-once, and then handle the gesture operation event through JavaScript without using Vue's responsive mechanism, thus avoiding the page redrawing problem.

In actual development, we can choose one or more of the above methods according to specific needs. Depending on the complexity and performance requirements of the project, we can use these methods flexibly to improve performance and user experience.

To sum up, how to solve the problem of page redrawing of mobile gesture zoom and rotate pictures in Vue development can be done by using custom instructions, local components and v-once instructions to avoid Vue's responsive mechanism affecting the page. Perform a redraw. By rationally selecting and applying these methods, we can improve the performance of mobile applications and enhance user experience.

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